For the UV offset printing of business card, after understanding the necessary configuration of the offset press, let's take a look at the requirements for the printing materials.
1. UV ink
UV inks are light-curing absorbent inks, because many cards require film lamination, and their own functions are particularly important. The hub has two points: First, it needs to withstand high temperature and high pressure, and it does not change color or fade under the high temperature and high pressure of the laminator; Second, the adhesion between the plastic film and the film should be large, and the minimum scale needs to reach 6N. In addition, the choice of UV ink for business card is also a commensurate hub. In addition to ensuring the quality index of the ink itself, it must also match the wavelength of the UV lamp of the printing press. Because many manufacturers use color inkjet manuscript as the original manuscript for printing, it is recommended to choose yellow and magenta of standard hue when purchasing ink. Green ink. In addition, when preparing spot color inks, try to choose inks with low viscosity and good mobility. European ink is better.
2. Special printing plate
The special printing plate for UV offset printing is wear-resistant and durable. It does not need to apply protective glue when it is stopped halfway. The old version can be used again. It is very suitable for the transfer of UV ink. The dot reduction rate is high during printing, which can basically reach 2% of the dots No loss, 98% of the dots can be distinguished. At present, the Fuji UV version of Japan is of good quality. Considering the printing cost, the ordinary version can be appropriately used for the short version of the batch, but the version film is very easy to wear, so pay more attention when printing.
3. Blanket and lining
In order to ensure the best transferability and dot reducibility of UV ink, it is best to use air cushion rubber cloth, because it has good acid resistance and oil resistance. The hydrophobicity and good ink transfer function can ensure the smallest dot deformation during printing, the printed graphics are clear, the high-profile department has good reproducibility, and the plate wear is small.
The rubber roller lining is better to use neutral and harder. Due to the rough surface of PVC and other sheets, it is easy to cause a high rate of printing dots. The use of neutral hard lining can make the dots clear, smooth and reproducible. The change of the geometric shape of the figure is small, and the increment of the width of the picture and the printed sheet is relatively small.
4. PVC and other sheets
Sheets such as PVC have a bright surface and a matte surface. The bright surface is smoother and the matte surface is rougher. It is important to choose the printing surface to avoid many printing quality problems. The matte surface of PVC and other sheets is usually used as the printing surface to ensure that the ink is not roughened and dotted during printing, and the adhesion between the ink and the material is strong. The ink is full and does not reveal small white spots. In addition, the printing pressure is appropriately increased by 0.02 to 0.05 mm compared to the standard pressure.
5. Auxiliary materials
Car wash water and blanket cleaner used in UV offset printing. The cleaning solution etc. are best to use special products, this is for UV ink roller. The service life and function of UV blankets and UV printing plates are particularly important. Although the cost will be higher, it can be used flexibly according to the actual situation. Ensure that the ink roller is cleaned once a week; use a special recovery agent to clean the blanket when the machine is shut down. This will not only ensure the effective elasticity of the blanket, but also ensure that the color balance is uniform and the color difference is avoided when restarting.
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